289A 和 289U 型:0.75 lb/0.3 kg 289H 型:1 NPT - 4 lb/2 kg, 2 NPT - 15 lb/7 kg 289HH 型:4 lb/2 kg 289L 型:15 lb/7 kg
289H:泄壓壓力調(diào)節(jié)范圍
0.5 至 2.25 psig / 34 至 155 mbar
289H:大泄壓(入口)壓力
25 psig / 1.7 bar
Fisher 289 Series relief valves are spring-loaded throttling relief valves used as downstream pressure regulators to protect the system from overpressure. A smooth throttling action minimizes pressure surges in the system during relief operation. 289 Series relief valves are ideal for low-pressure settings due to the increased sensitivity provided by a large diaphragm area. 289 Series relief valves are designed for pressure control; they are not ASME safety relief valves.
Features
Throttling Type Relief
High Flow Rates
Small Size
Reliability Due to Simplicity
Compact Design
Specifications
Body Sizes and End Connection Styles
Types 289A and 289U: 1/4 NPT Type 289H: 1, 2 NPT Type 289HH: 1 NPT Type 289L: 3/4, 1 NPT Type 289U: 1/4 NPT
Maximum Allowable Relief (Inlet) Pressure
100 psig / 6.9 bar
Relief Set Pressure Ranges (5 models)
5wc to 50 psig / 25mbar to 3.5 bar
Pressure Registration
Internal
Temperature Capabilities
Nitrile (NBR) and Neoprene (CR) Elastomers: -20 to 150°F / -29 to 66°C Fluorocarbon (FKM): 20 to 300°F / -7 to 149°C Available with Types 289H and 289HH only
Approximate Weights
Type 289A and 289U: 0.75 Pounds / 0.3 kg Type 289H: 1 NPT - 4 Pounds / 2 kg, 2 NPT - 15 Pounds / 7 kg Type 289HH: 4 Pounds / 2 kg Type 289L: 15 Pounds / 7 kg
289H: Relief Adjustment Ranges
0.5 to 2.25 psig / 34 to 155 mbar
289H: Maximum Relief (Inlet) Pressure
25 psig / 1.7 bar
Fisher China Guangzhou Honest Gas Equipment Co., LTD.